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Quiz: Lifes Chemical Basis 1.List the name of the four most common elements found in humans. 2.Isotopes that are unstable and emit energy are called?? List one biological use for these. 3.The total number of protons and neutrons in a nucleus of one atom is represented by?? 4.Results when two or more atoms bond together. (both NaCl and H 2 O fit here) 5.What is a hydrogen bond? Explain the biological importance of hydrogen bonds